<script lang="ts">
	import { onMount } from 'svelte';
	import { goto } from '$app/navigation';
	import { toast } from 'svelte-sonner';
	import { getConfig, login } from '$lib/services/photoprism';
	import { isAuthenticated } from '$lib/stores/session.svelte';

	let username = $state('');
	let password = $state('');
	let submitting = $state(false);
	// OIDC config probed lazily from /api/v1/config (no auth required).
	// Empty when OIDC is dormant; populated triggers the SSO button.
	let oidc = $state<{ provider: string; loginUri: string } | null>(null);

	$effect(() => {
		if (isAuthenticated()) {
			void goto('/', { replaceState: true });
		}
	});

	onMount(async () => {
		try {
			const cfg = await getConfig();
			const ext = cfg.ext?.oidc;
			if (ext?.enabled && ext.loginUri) {
				oidc = { provider: ext.provider || 'OIDC', loginUri: ext.loginUri };
			}
		} catch {
			// /config is best-effort — SSO button just stays hidden.
		}
	});

	async function onSubmit(e: SubmitEvent) {
		e.preventDefault();
		if (submitting) return;
		submitting = true;
		try {
			await login(username, password);
			toast.success('Signed in');
			await goto('/', { replaceState: true });
		} catch (err) {
			const msg = err instanceof Error ? err.message : 'Login failed';
			toast.error(msg);
		} finally {
			submitting = false;
		}
	}

	function onOidcClick() {
		if (!oidc) return;
		// Full reload so PhotoPrism handles the redirect + cookie set on
		// its own; the SPA picks up the resulting session on return via
		// bootstrapSessionFromCookies in the root layout.
		window.location.href = oidc.loginUri;
	}
</script>

<div class="flex min-h-screen items-center justify-center bg-background p-6">
	<form
		onsubmit={onSubmit}
		class="w-full max-w-sm space-y-5 rounded-lg border border-border bg-card p-8 shadow-sm"
	>
		<header class="space-y-1">
			<h1 class="text-2xl font-semibold tracking-tight text-foreground">Mulimage</h1>
			<p class="text-sm text-muted-foreground">Sign in to your account.</p>
		</header>

		<label class="block space-y-1.5">
			<span class="text-sm font-medium text-foreground">Username</span>
			<input
				type="text"
				autocomplete="username"
				required
				bind:value={username}
				class="w-full rounded-md border border-input bg-background px-3 py-2 text-sm shadow-sm focus:outline-none focus:ring-2 focus:ring-ring"
			/>
		</label>

		<label class="block space-y-1.5">
			<span class="text-sm font-medium text-foreground">Password</span>
			<input
				type="password"
				autocomplete="current-password"
				required
				bind:value={password}
				class="w-full rounded-md border border-input bg-background px-3 py-2 text-sm shadow-sm focus:outline-none focus:ring-2 focus:ring-ring"
			/>
		</label>

		<button
			type="submit"
			disabled={submitting}
			class="w-full rounded-md bg-primary px-4 py-2 text-sm font-medium text-primary-foreground shadow-sm hover:opacity-90 disabled:opacity-50"
		>
			{submitting ? 'Signing in…' : 'Sign in'}
		</button>

		{#if oidc}
			<div class="relative py-1">
				<div class="absolute inset-0 flex items-center" aria-hidden="true">
					<div class="w-full border-t border-border"></div>
				</div>
				<div class="relative flex justify-center">
					<span class="bg-card px-2 text-xs text-muted-foreground">or</span>
				</div>
			</div>

			<button
				type="button"
				onclick={onOidcClick}
				class="w-full rounded-md border border-input bg-background px-4 py-2 text-sm font-medium text-foreground shadow-sm hover:bg-muted"
			>
				Sign in with {oidc.provider}
			</button>
		{/if}
	</form>
</div>
